Kindly Share your bike's GPS speed

Hi everybody,
For long time, i had the doubt that bikes 100cc and below usually show much higher than actual speed on the meter.
So today i decided to check my Junoon's meter with my HTC GPS speedometer and i was ready to see about 10Km/h error at high speed but result was much more shocking.
I took the bike to 90Km/h and my pillion friend holding my mobile reported that i am going at 76Km/h only i was shocked to hell, so i told him to hold on and then raved the ***** out of bike , was able to do 110Km/h (on a slight slopy road) but my friend reported again that i am actually going at only 90Km/h according to mobile GPS.

Severely disappointed to know the inaccuracy of my bike's meter and also to know that usually when it is maxing out at 90Km/h, it is actually doing only 76Km/h.
So Bike meter 90Km/h= 76Km/h actual speed
Bike meter 110Km/h= 90Km/h acutal speed

So if anyone of you has ever checked your bike's meter with GPS , kindly share it here so that everybody can get the idea of which bike is actually doing the real speed instead of just showing it on the meter.....Kindly do speed tests in controlled environment only (preferably on some empty road outside the populated areas), and please must wear the helmet at least before you unleash your rides.

PS: I have matched my mobile's GPS speedometer with Car's meter and it shows exactly same speed as on the car's meter so no doubt about its acccuracy. By the way my bike has Alson's speedometer which i think is considered more accurate.
Below is the screenshot from mobile showing maximum achieved speed aka 90Km/h. App name is "Ulysse Speedometer"
Tip to take screenshot in Android: Press and hold down power button, and then press the home button, screenshot will be saved to your camera shots folder.

Last sunday cold weather done the job for me.... finally achieve the maximum speed of 98km/h from my chonda 70...... it was on islamabad highway..... little heads down not deaccelerate the bike nearly 2km until i thought that it was enough for my 70.... that day wind was negligible & heads down making possible low resistance to acheive high speed........ i think little effort would put it to 100km/h but not tried yet.........!

Last sunday cold weather done the job for me.... finally achieve the maximum speed of 98km/h from my chonda 70...... it was on islamabad highway..... little heads down not deaccelerate the bike nearly 2km until i thought that it was enough for my 70.... that day wind was negligible & heads down making possible low resistance to acheive high speed........ i think little effort would put it to 100km/h but not tried yet.........!

Wow that's really good share your bike details with us and which engine oil u r using

its a 2009 chonda just kept with great care...... i use Castrol Activ(20w-50) since fisrt day..... and change oil every 1000kms... nothing is changed all stock....... never gone to mechanics.... what i do regular after 1000kms is just oil change+ air filter change+ cleaning spark plug...... and some thing i not do regular is cleaning carb util i feel it got dirty + NGK spark plug when it need to be changed......................!

the phenomena i uses to achieve high speed is cold weather....... the cold weather provides you a colder air which is denser then normal so denser air= more air= more oxygen.... so actually more oxygen is good for combustion process this results more power and that little power actually do the speed job..... this power is so small but it adds 3 to 4km/h(or even more) in your top speed........... !

its a 2009 chonda just kept with great care...... i use Castrol Activ(20w-50) since fisrt day..... and change oil every 1000kms... nothing is changed all stock....... never gone to mechanics.... what i do regular after 1000kms is just oil change+ air filter change+ cleaning spark plug...... and some thing i not do regular is cleaning carb util i feel it got dirty + NGK spark plug when it need to be changed......................!

for plug in atlas honda cd70 user manual it is recommended to change spark plug at 11000km

its a 2009 chonda just kept with great care....... never gone to mechanics

that means you have not got your bike tuned since you bought in 2009
how many km's your bike is driven and which company manufactured/assembled

AFAIK GPS can give error too under too many circumstance like weather, bumpy road and tunnels etc. My experience is we were constantly checking the GPS on our recent road trip to Baluchistan. The GPS speed was always well below the car's. Though, the vehicle was Toyota's latest Hiace.
Besides, changing tyres/ meters/ or any other related part could vary the reading on speedo. You should do such test on stock conditions.